Brian David Josephson

Brian David Josephson
(1940)

British physicist whose discovery of the Josephson effect while a 22-year-old
graduate student won him a share (with Leo Esaki and Ivar Giaever) of
the 1973 Nobel Prize for Physics.
He entered Trinity College, Cambridge, in pursuit of an education in
physics and received his bachelor's (1960) and master's and Ph.D. degrees
(1964) there, publishing his first work while still an undergraduate;
it dealt with certain aspects of the special theory of relativity and
the Mossbauer effect. He was elected a fellow of Trinity College in
1962. He was a brilliant and assured student; one former lecturer recalled
a special need for precision in any presentation to a class that included
Josephson--otherwise, the student would confront the instructor politely
after class and explain the mistake.

While still an undergraduate, Josephson became interested in superconductivity,
and he began to explore the properties of a junction between two superconductors
that later came to be known as a Josephson junction. Josephson extended
earlier work in tunneling, the phenomenon by which electrons functioning
as radiated waves can penetrate solids, done by Esaki and Giaever. He
showed theoretically that tunneling between two superconductors could
have very special characteristics, e.g., flow across an insulating layer
without the application of a voltage; if a voltage is applied, the current
stops flowing and oscillates at high frequency. This was the Josephson
effect. Experimentation confirmed it, and its confirmation in turn reinforced
the earlier BCS theory of superconductor behaviour. Applying Josephson's
discoveries with superconductors, researchers at International Business
Machines Corporation had assembled by 1980 an experimental computer
switch structure, which would permit switching speeds from 10 to 100
times faster than those possible with conventional silicon-based chips,
increasing data processing capabilities by a vast amount.

He went to the United States to be a research professor at the University
of Illinois in 1965-66 and in 1967 returned to Cambridge as assistant
director of research. He was appointed reader in physics in 1972 and
professor of physics in 1974. He was elected a fellow of the Royal Society
in 1970.

A few years before the Nobel award, Josephson grew interested in the
possible relevance of Eastern mysticism to scientific understanding.
In 1980 he and V.S. Ramachandran published an edited transcript of a
1978 international symposium on consciousness at Oxford under the title
Consciousness and the Physical World.